{
  "bibcode": "2018GCN.22576....1S",
  "body": "M. Stamatikos (OSU), S. D. Barthelmy (GSFC),\nJ. R. Cummings (CPI), H. A. Krimm (NSF/USRA),\nA. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC),\nD. M. Palmer (LANL), T. Sakamoto (AGU),\nT. N. Ukwatta (LANL) (i.e. the Swift-BAT team):\n\nUsing the data set from T-239 to T+963 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 180331B (trigger #820513)\n(Lien et al., GCN Circ. 22573).  The BAT ground-calculated position is\nRA, Dec = 196.781, 61.735 deg which is\n  RA(J2000)  =  13h 07m 07.6s\n  Dec(J2000) = +61d 44' 05.9\"\nwith an uncertainty of 2.0 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 30%.\n\nThe mask-weighted light curve shows a double-peaked structure that starts\nat ~T-20 s and ends at ~T+140 s. The two peaks occur at ~T-20 s and ~T+1 s,\nrespectively. T90 (15-350 keV) is 147.0 +- 33.1 sec (estimated error including systematics).\n\nThe time-averaged spectrum from T-22.03 to T+142.97 sec is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n2.48 +- 0.22.  The fluence in the 15-150 keV band is 1.9 +- 0.2 x 10^-6 erg/cm2.\nThe 1-sec peak photon flux measured from T+0.97 sec in the 15-150 keV band\nis 2.8 +- 0.3 ph/cm2/sec.  All the quoted errors are at the 90% confidence\nlevel.\n\nThe results of the batgrbproduct analysis are available at\nhttp://gcn.gsfc.nasa.gov/notices_s/820513/BA/",
  "circularId": 22576,
  "createdOn": 1522539824000,
  "email": "amy.y.lien@nasa.gov",
  "subject": "GRB 180331B: Swift-BAT refined analysis",
  "submitter": "Amy Lien at GSFC  <amy.y.lien@nasa.gov>",
  "eventId": "GRB 180331B"
}